Backfire on shutoff?

Thread Tools

Starting in June or so, it started stalling at idle unless I either choked it or kept on the throttle. I adjusted the idle knob on the carb and raised the idle. That seemed to solve that problem, but now when I shut off, I get a small, quiet backfire. If I choke it when I start it, the backfire is worse. I've tried backing off on the idle speed a bit but then it starts sputtering and stalling again.

The bike was tuned up at the end of last season, it has had about 2000 miles since, oil is fresh as of the beginning of the season. I use 93 octane gas.

Not exactly a bike, but our lawnmower backfires if shutoff at a low rpm. If the throttle is left all the way open, no backfire. My dad believes it's basically dieseling since the engine heats up so much from being run at full throttle for over an hour. Have you checked your cooling system for leaks or blockages?

Glock Talk is the #1 site to discuss the world’s most popular pistol, chat about firearms, accessories and more. As our membership continues to grow we look forward to reading your stories and learning from your experiences. Membership is free and we welcome all types of shooters, whether you're a novice or a pro. Come for the info, stay and make some friends..